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  (Photo: Twitter/Selena Gomez)
  Selena Gomez posted a photo of she and her "Wizards of Waverly Place" co-star Gregg Sulkin.
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  (Reuters/Mario Anzuoni)
  Singer Justin Bieber, holding a snake in his hand, kisses Selena Gomez as they arrive at the 2011 MTV Video Music Awards in Los Angeles, August 28, 2011.

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Selena Gomez has sparked rumors of her relationship with Justin Bieber ending after spending time with her co-star Gregg Sulkin.

Gomez, 22, is currently on set filming "Wizards of Waverly Place" alongside Sulkin, 20.

A frequent Twitter user, Gomez updated her fans from the set noting that the long hours spent with Sulkin.

"Shooting at 2 am and this is where me and Gregg end up," wrote the actress along with a photo of she and Sulkin.

While Gomez was hard at work in Los Angeles this week, her boyfriend Justin Bieber took the stage during the 2012 Victoria's Secret fashion show in New York City.

Wednesday's taping of the show saw dozens of supermodels take the runway in designer lingerie as well as performances by Bieber, Bruno Mars, and superstar Rihanna.

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Bieber described his excitement while on the pink carpet ahead of the event.

"It's like a dream come true," said the "Boyfriend" singer on the pink carpet ahead of the show, according to AP. "I would rather be here than anywhere in the world."

Moreover, some reports indicated that Bieber was exchanging numbers with models backstage during the events, according to TheCelebrityCafe.

The pop singer was even rumored to have attended "The Lion King" on Broadway alongside Victoria's Secret model Barbara Palvin after his performance on the runway.

Meanwhile, as Wednesday's fashion show got underway, Rihanna, Mars, and Bieber each performed alongside models including Adriana Lima, Erin Heatherton, Miranda Kerr and Alessandra Ambrosio .

During the show, Lima said the atmosphere on stage was "electric."

"It's so much fun to be able to interact with the audience," continued the model, according to The Associated Press. "What other show will you see Rihanna, Justin Bieber, and Bruno Mars on the runway with angels?"

Rihanna performed her song "Diamonds" while Mars sang his hits "Locked Out of Heaven" and "Young Girls."

The fashion show will air on CBS on Dec. 4.